Now cinder’s get-pools API doesn’t support filtering pools by volume type,
and this is inconvenient when administrators want to know the specified pool’s
state which also can meet volume type’s requirements, the administrators also
can get all pools and filter them on their own, but it’s more complicated and
inefficient. This change intends to cover this situation and bring more
convenience to administrators.

Administrators also can retrieve and filter on their own, but it’s more
complicated and inefficient. This change can reduce the request amount and
filter unnecessary data transmitted from server to client.